Super Mario 63

[ciro64]

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Super Mario 63 was made by Runouw back in 2009 and is one of the most fondly reminded and nostalgic Mario fan games. It features level exploration and a moveset reminiscing of SM64, but in unique and charming 2D levels. There's also elements from a mixture of games, incuding F.L.U.D.D from Super Mario Sunshine. Also features a level editor.

A fan-remake called Super Mario 63 Redux exists, as well the fan sequel Super Mario 127.